Apparatus for drying paper



Jan. 27. 1925. 1,524,507

0. s. CHRISTIE ET AL APPARATUS FOR DRYING PAPER Fil ed Oct. 2, 1922 3 Sheets-Sheet 1 Jim, 2'70 W2.

c. s. CHRHSHE ET m.

APPARATUS FOR DRYING PAPER Filed Oct. 2, 1922 5 Sheets-Sheet 2 Jan. 27, 1925 C. S. CHRISTIE ET AL APPARATUS FOR DRYING PAPER Filed Oct. 2. 1922 3 Sheets-Sheet 5 bar 612K075.

Patented Jan. 27, 1925. 1,524,507 UNITED STATES PATENT OFFICE.

CHARLES STUART CHRISTIE AND ERNEST A. POTTER, OF ESPANOIIA, ONTARIO,

CANADA.

APPARATUS FOR DRYING PAPER.

Application filed October 2, 1822. Serial K0. 591,807.

To all whom it may concern: pense with the felt dryers, and the conse- Be it known that we, CHARLES-STUART quence is that we can reduce the cost of CHRISTIE and ERNEST AL Po'rrnn, subjects manufacture of machines of this classmuch of the King of Great Britain and of the below that now quoted. Another important United States, respectively, and both residfunction performed by the felts is that of ing in Es anola, District of Sudbury, Provcarrying the web of paper through the maince of ntario, Canada, 'have jointly inchine and maintaining it in contact with vented certain new and useful Improvethe dryer rolls, but we have found that when ments in A paratus for Dryin Paper, of we utilize the automatic back tender, We can 10 which the illowing is a speci ation. dispense with the felts, and the felt dryers,

' Our invention relates to improvements because by the time the web of paper reaches in apparatus for drying paper, and the printhe poney dryer, its tensile strength is sulficipal objects of our invention are: first, to cient to permit it to be threade through dispense with the use of the d or felts; the machine through the medium of the au- 15 second, to utilize otherwise waste eat from tomatic back tender. In threading the the dryer rolls to heat air drawn from the web through this machine, the attendant machine room for the purpose of drying need only wrap the tail 'end of the web the paper; third, to simu taneously dry bothv around the ropes of the back tender, which sides of the web of paper a3 by directap- .will function in a manner well-known to 20 plication of the web to the er rolls and ultimately draw the web through the mab) by currents of heated air owing longichine. The tail of the web used to draw the tudinall of certain of the dryer rolls, and rest of the web through the machine is torn in the cllowing s ecification we shall deoff when the web is properly positioned on scribe our preferre form of apparatus, and the dryer rolls.

25 what we claim as new will be set forth in In machines of this class, the dryer rolls .the claims formingpart of this specification. are exposed to the air in the machine room F ig.- 1 is, in part, a side elevation of our at each end, and frequentl cold draughts referred form of apparatus, certain parts of air'come in contact wit these exposed eing shown in vertical longitudinal section.- ends, With the result that the temperature 30 The apparatus is shown as mounted within within the rolls at these ends is reduced, and a suitable building. 2 is a vertical sec- "a uniform drying of the web. of paper will tion on the line 22, ig. 1, Fig. 3 is an not be'ha'd. Now we close in the dryer rolls elevation of the dr end of the apparatus, and otherwise control the direction of move- .with certain parts rcken away and shown ment of currents of heated air through the 35 in section. Fig. 4 is a plan view of the aphousing or casing for the machines to effect paratus, shown in Fig. 1, with certain parts the purpose in view, I

shown in horizontal section. Fig. 5 is a In machines using felts, relatively little fragmentaryview of one of the dryer rolls, of the outer side of the web is exposed 'to showing the sheave for the ropes of the authe air, and the currents of air that come 40 tomatic back tender, and Fig. 6 is a central in contact with the exposed side of said web longitudinal section through one end of one of paper vary in temperature and direction, of the dryer rolls, showingmore particuparticularl in winter time in this latitude, larly the sheave for the ropes of the autoportions 0 the machine be located opposite matlc-back tender, in relation to the stubdoor-ways leading from rooms where the 45 shaft of the dryer roll. temperature is considerably lower than that In the drawings, like characters of referobtaining 'in the paper machine room. The once refer to the same parts. balance of the outer surface of the web of It is now common in the art to utilize paper is blanketed by the felts, and the reheated dryer rolls, around which pass felts. sult is that these portions of the web of 50 One of the functions of the felts is to abpaper can only directly yield up the moissorb, moisture from the web of paper and so ture according to the absorbing capacity of assist the dryer rolls in .performin their that portion of the felts in contact therefunction, but when felts are used, fe t drywith.

ers must also be need. Now since we dis- 'Dryer rolls are usually mounted in horipause with the felts, we consequently disaontal-rows, one above t e other, thedryer no rolls in each row occupying a staggered position in relation to the dryer rolls above or below, and the consequence is that kets extending longitudinally of the ro ls and located between each pair of dryer rolls in the lower row, and roofed, so to speak, by a dryer roll in the upper row, are formed. Now our object is to force draughts of heated air through these pockets so as to prevent stagnation therein of the water "a or and so facilitate drying.

ince we do not require to use felts, we can operate with a considerably lower steam pressure within the dryer rolls, and thus effect economy in fuel.

, Our preferred form of apparatus embodies dryer rolls A and B located in upper and lower rows, as shown clearly in Fig. 1, and in staggeredrelationship as beforementioned. These dryer rolls ma be of any desired construction, and a suita le way of supportin them is to journal the stub-shafts C- thereoi in suitable standards, D. The stub-shafts E have bearing in the standards F. The stub-shafts E are in the form of pipes, and by means of the usual pipes G and couplings, steam is conveyed 'to and from said dryer rolls through the medium of the pipes H. Of course there is nothing new in the parts just described. The saiddryer rolls are driven in any suitable manner as.

by means of the meshin gears I which are coupled to the stub-shags E. J is the pit which is formed by the side and end walls 2 and the floor 3, which walls extend up to the floor 4 of the building 5, which floor is provided with an opening leading into the pit J. 6 is a hood or roof located above the dryer rolls, preferably gable-shaped. The hood or root 6 is provided with side walls 7 which extend down to the floor at, and therefore these side walls co-operatewith said hood 6 and walls 2 and the floor 30f the pit to form a housing for the dryer rolls. These side walls may embody movable-panels such as sliding doors 8 to permit access to the ends of the dryer rolls. These anels or sliding doors may be of any we l-known construction, and they are merely diagrammatically illustrated in the drawings. Extending longitudinally of the hood or root '6 at each side thereof, are conduits 9 which open into conduit 10 located at the dry end of the machine. Located underneath the hood or roof 6 are a plurality ofconduits 12, spaced apart, which open into the conduits 10 and 11.

Extending along the sides of the machine are conduits 13 and 14 which are coupled in any suitable manner (see Figs. 2 and 3) to a conduit 15 which opens into a fan or blower chamber 16 which communicates with the conduit 11.

The inner sides of the conduits 13 and 14 are apertured to permit outlet pipes 17 to be connected therewith, which pipes extend I throu h apertures formed in the walls 2, into t e pit J.

The automatic back tender is of a wellknown construction, and it comprims a plurality of pulleys 18 suitabl mounted, over which pass theropes 1.9. hese ropes pass around sheaves 20 suitably associated with one end of the dryer rolls, and the function of said automatic back tender is to thread the paper, in a manner already known around the'various dryer rolls. The wet paper 21. enters the machine at the wet end through the opening 22, which openin is located between the wall 23 of the con uit 11 and the closure member 24 carried by the floor 4, and located outside the pony roll 26. Upon referring particularly to Fig. 1 the paper 21 will be seen passed around the various dryer rolls.

Steam usually at a pressure from 12 to 14 pounds per square inch is passedinto the dryer rolls through the tubular stub-shafts E, and the heat therefrom expels the moisture content from the web of paper, and one of the objects of our invention is to utilize the otherwise waste heat escaping from said dryer rolls to heat currents of air drawn from the machine room to dry the pa r, and to remove water-vapor from the poo-Kits 27 formed by the space between the various dryer rolls in the lower row and the staggered dryer rolls in the upper row, when the web of paper is going through the machine.

Any suitable blower or fan 28 is mounted within the chamber 16, and suitably driven. Now since the conduits 9 are provided with apertures 29, air is drawn from the machine room by the action of the fan or blower 28 through these conduits into the conduit 10, and thence through the conduits 12 into the conduit 11 and thence through the conduits 13 and Hand outlet pipes 17 into the pit J. As the air passes through the conduits 12, the temperature thereof is raised very considerably by reason of the heat within the housing for the dryer rolls. and therefore when it escapes into the pit J it serves the purpose of hastening the drying of the web of paper.'

It will be observed upon referring particularly to Fig. 4 that the outlet pipes 17 are in a staggered position in respect of the sides of the machine, and are located aproximately underneath the pockets 27 (see ig. 1). The result is that the water-vaporladen air in said pockets is moved 'lon itudinally of said dryer rolls to the ends t ereof, between which ends and the side walls 7' (see Fig. 2) it escapes into the upper portion of the housing for aaid dryer rolls, and.

thence naturally, or b mechanical means it is exhausted throug the ventilators 30 which open through the hood or roof 6.

"We prefer to divide the conduit 10 by usual means of a partition a (see Fig. 4.) so as to equalize the currents of air drawn through the conduits 12 at each side of the machine. .The conduits 13 and 14 are preferably tapered (see Fig. 1) so as to equalize the air currents received in the pit J, which currents are utilized to remove the vapor from the pockets 27. From what has been set forth it is clear that we control sufficiently the path of various air currents through the housing for the dryer rolls to effect the purpose in view. The opening 22, and the opening I) and c at the wet and dry ends of the machine are not sufficient to interfere with the attaining of the object we have in view.

In winter time in order to keep theroof d of the building dry we make use of the conduit 6 forming part of the heating system.

.pon referring particularly to Fig. 1, it isself-evident that we simultaneously ultimately heat-treat both surfaces of the.

web of paper, and in such a manner as to remove in the quickest manner the vapor content thereof. The currents of hot air flowing longitudinally of the dryer rolls in the lower row, and through the pockets 27 come directly in contact with the other surface of large areas of the web of paper while the inner surface of the major portion of said areas, is directly in contact with Since the undersides of the dryer rolls in the top row, which form the roofing, so to speak, of the pockets 27, are exposed directly to the flowing currents of hot air, the moisture adhering to these exposed sides will be largely carried away by these currents of air, thuspresenting frequently relatively dry surfaces of the heated rolls to the web. In effect, the currents of hot air flowing through the pockets 2? perform the function performed by the felt dryers before mentioned.

Various changes in details of construction may be effected without departing from the spirit of our invention.

What we claim is:

1. An apparatus of the class set forth comprising a plurality of driven heated the dryer rolls.

paper rality of conduits in said housing and adapt- F ed to be heated by the heat escaping from said dryer rolls; means to permit air to pass from the machine room into and through said conduits in said housing so that the temperature of said air may be raised, and means whereby said heated air may be passed into said housing and below saiddryer rolls, for the purpose set forth.

apparatus of the class set forth comprising a plurality of driven heated dryer rolls around which the webs of paper to be dried is passed; a ventilated housing for said dryer rolls; apertured conduits adapted to receive air from the machine room; conduits at the ends ofsaid housing, into one of which passes the air from said first-men tioned conduits; a plurality of conduits connecting together the conduits located at the ends of said housing, and located within said housing and rolls, and means communicating with the conduit at the wet end of the machine, adapted to convey housing and below purpose set forth.

3. An apparatus of the class set forth comprising a plurality of driven heated dryer rolls around which the web of paper to be dried is passed; a ventilated housing for said dryer rolls; apertured conduits adapted to receive air from the machine room; conduits at the ends of said housing. into one of which passes the air from said first-mentioned conduits; aplurality of conduits connecting together the conduits located at the ends of said housing, and located within said housing and above said heated dryer rolls; a blower or fan connected with the conduit at the wet end of the machine, and

said dryer rolls, for the a pair of conduits located at the sides of said heated air into said housing and underneath housing and adapted to convey said said dryer rolls. CHARLES ERNEST A.

STUART CHRISTIE.

POTTER.

above said heated dryer said heated air into said 

